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公开(公告)号：JPH11122978A
公开(公告)日：1999-04-30
申请号：JP22277198
申请日：1998-08-06
Applicant: ST MICROELECTRONICS SRL
Inventor： GALBIATI EZIO , BOSCOLO MICHELE , BERTOLINI LUCA
Abstract: PROBLEM TO BE SOLVED: To control currents of respective windings individually by a method wherein the signals of two detection resistors are compared with a same reference signal to generate logic triggers and signals generated by monostable multivibrator in accordance with the logic triggers, and signals generated by phase switching are supplied to synthetic logic gates which output signals for driving respective half bridges. SOLUTION: A current which flows through a winding A is supplied by turning on transistors T1A and T4A. If the voltage drop of a detection resistor RS2 exceeds a control voltage, the output of a comparator COMP2 triggers a monostable multivibrator ONE2 to change its output to a logic value 1 for a required period. Since an Ina signal and the output signal of the monostable multivibrator ONE2 after the OR process change a gate output OR-a (= drive signal INa) to a logic value 1, the MOS transistor T4A is turned off and a MOS transistor T3A is turned on. Then, the MOS transistors T1A and T4A are turned on to start the increase of a current in the phase winding A. If the voltage drop of the detection resistor RS2 exceeds the control voltage, this cycle is repeated.
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公开(公告)号：JPH1175388A
公开(公告)日：1999-03-16
申请号：JP19939898
申请日：1998-07-15
Applicant: ST MICROELECTRONICS SRL
Inventor： VITI MARCO , BOSCOLO MICHELE , SALINA ALBERTO
Abstract: PROBLEM TO BE SOLVED: To realize a rotor position detection system of a multiphase brushless DC motor which is driven with a mode of supplying power to all phase windings. SOLUTION: In the rotor position detection method of a multiphase brushless motor which is driven with a multipole mode and has a zero-cross detection circuit for induction signals in phase windings, the driving signal in the phase winding of the motor which is connected to the zero-cross detection circuit is interrupted by using a 1st logic command (ENABLE). At a certain lapse of time after the start of the interruption, a logic gate which recognizes the zero-cross detected by the zero-cross detection circuit is enabled by using a 2nd logic command (MAK). Then, at a certain lapse of time after the start of the interruption, both the logic commands (ENABLE and MASK) are reset.
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公开(公告)号：JPH11341861A
公开(公告)日：1999-12-10
申请号：JP12352099
申请日：1999-04-30
Applicant: ST MICROELECTRONICS SRL
Inventor： GALBIATI EZIO , BOSCOLO MICHELE , VITI MARCO
Abstract: PROBLEM TO BE SOLVED: To reduce switching loss by firmly keeping one of motor windings in low or high saturation periodically for a prescribed duration, applying the voltage of a second line to the other phase winding which is different from a first periodical voltage line, and matching the voltage of respective windings with the first periodical voltage line. SOLUTION: Samples of a voltage value profile are stored in a MEMOR, and a register Kval coefficients of three bytes to be read respectively are reduced in a MUL (numerical value multiplier). The three samples converted into a MUL are subjected to PWM conversion by a BYTE TO PWM, and the output PWM signals of the three samples are inputted into the three half bridge stages constituted of outputs BJT or MOS for providing required power gain. When one of the three values inputted into a converter in a switching phase becomes zero, the respective half bridges become low-saturated in a duty cycle, where a corresponding PWM output signal is 0%. When one of the three values becomes equals to a positive peak value, the respective half bridges become high-saturated in a duty cycle, where a corresponding PWM output signal is 100%. A BEMF DET detects a rotor, and A/C phases are switched for synchronization.
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公开(公告)号：DE60202436D1
公开(公告)日：2005-02-03
申请号：DE60202436
申请日：2002-02-19
Applicant: ST MICROELECTRONICS SRL
Inventor： GALBIATI EZIO , BOSCOLO MICHELE
IPC: H02M7/5387 , H02P25/02 , H02P7/00 , G11B5/55
Abstract: The present invention relates a Pulse Width Modulation (PWM)/linear driver for an electromagnetic load by a bridge circuit (15) of the type having a signal input (Vm, GND) and a signal output (OutM, OutP) and at least two conduction control inputs (C1, C2) for driving a voice coil motor (VCM) in a linear mode and in a pulse width modulation (PWM). The bridge circuit (15) is driven by a PWM converter (16) coupled to one (C1) of said two control inputs and by a linear amplifier (17) coupled to the other (C2) of said two control inputs.
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公开(公告)号：DE69721757T2
公开(公告)日：2003-11-13
申请号：DE69721757
申请日：1997-08-08
Applicant: ST MICROELECTRONICS SRL
Inventor： GALBIATI EZIO , BOSCOLO MICHELE , BERTOLINI LUCA
Abstract: The control of the current in PWM mode through independently controlled windings of a multiphase motor driven in a "bipolar" mode is implemented by employing only two sense resistors and related control loops, regardless of the actual number of windings.
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Patent Agency Ranking
公开(公告)号：DE69721757D1
公开(公告)日：2003-06-12
申请号：DE69721757
申请日：1997-08-08
Applicant: ST MICROELECTRONICS SRL
Inventor： GALBIATI EZIO , BOSCOLO MICHELE , BERTOLINI LUCA
Abstract: The control of the current in PWM mode through independently controlled windings of a multiphase motor driven in a "bipolar" mode is implemented by employing only two sense resistors and related control loops, regardless of the actual number of windings.
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公开(公告)号：DE69831776T2
公开(公告)日：2006-08-17
申请号：DE69831776
申请日：1998-07-09
Applicant: ST MICROELECTRONICS SRL
Inventor： VITI MARCO , BOSCOLO MICHELE , SALINA ALBERTO
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公开(公告)号：DE69927373D1
公开(公告)日：2005-10-27
申请号：DE69927373
申请日：1999-09-30
Applicant: ST MICROELECTRONICS SRL
Inventor： GALBIATI EZIO , BOSCOLO MICHELE , VITI MARCO
Abstract: A method of detecting the zero-cross event of an induced back electromotive force or of the nullification instant of a periodic current in a PWM driven winding, by circuits generating an analog signal representative of said back electromotive force or of said current, means for comparing said analog signal with zero and producing a first logic signal (READ _ZC), means for generating a PWM driving signal, means for storing the duration of the time interval between two consecutive zero-cross events, includes: storing the value (TC) of the time interval between the last two events of zero-cross detected; synchronizing the PWM driving signal at the end of a time interval from the instant of the last zero-cross detected of duration equal to the difference between ae time (TS) established in function of said stored value (TC) and a first prefixed value (T1); if a new zero-cross event is not detected within said established time (TS), disabling the switching of the PWM signal for a time interval, the maximum duration of which is equal to a second prefixed value or until the occurrence of a new zero-cross event. A hardware implementation is also described.
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公开(公告)号：ITMI20041864A1
公开(公告)日：2004-12-30
申请号：ITMI20041864
申请日：2004-09-30
Applicant: ST MICROELECTRONICS SRL
Inventor： BOSCOLO MICHELE
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公开(公告)号：DE69916776D1
公开(公告)日：2004-06-03
申请号：DE69916776
申请日：1999-02-04
Applicant: ST MICROELECTRONICS SRL
Inventor： VITI MARCO , BOSCOLO MICHELE
IPC: H02P6/22
Abstract: A start-up routine for a multiphase brushless DC motor having one or more rotor position sensors insufficient to provide for an angular resolution as high as the angular resolution of the synchronized driving system of the motor, consists in: a) fixing of at least an angular check zone of a certain arc length angularly corr lated to the position of said sensor or sensors; b) assessing or presuming a certain initial rest position of the rotor; c) exciting for fixed time intervals the phase windings in a sequence such to rotate the rotor toward an angular position next to the initial position, in the desired direction, while masking the signals or digital codes of the position sensor or sensors for a preestablished masking time; d) repeating step c) until verifying that the excited phases are those commanding advancement of the rotor toward said angular check zone, or a change of state of the signals of said position sensor or sensors, if the masking time has elapsed; e) associating to each code of said position sensor or sensors a new angular check zone to be reached by repeating the sequence of operations starting from step c).
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